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DFlight API vs GrünstromIndex

Same instrument, two spec sheets — measured, not claimed.

APIDFlight APIDEAD0GrünstromIndexHEALTHY53
Uptime · 30d
Uptime · 90d11.8%73.5%
Uptime · 30d0.0%73.3%
P50 · ms3191072
P95 · ms6684119
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree under fair-use policy
Rate limitUnpublishedFair-use (paid tiers for higher limits)
In directory since2026-07-052026-07-05
operationalpartialdownno data

DFlight API vs GrünstromIndex: common questions

Which is more reliable, DFlight API or GrünstromIndex?

On our scheduled checks, GrünstromIndex leads on measured uptime — DFlight API at 11.8% versus GrünstromIndex at 73.5% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, DFlight API or GrünstromIndex?

DFlight API has the lower median latency in our checks — DFlight API responds in 319 ms versus GrünstromIndex at 1072 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do DFlight API and GrünstromIndex need an API key?

Neither needs a paid key — DFlight API is callable with no signup, and GrünstromIndex is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call DFlight API and GrünstromIndex from the browser?

Only GrünstromIndex is browser-friendly — it returns CORS headers over HTTPS. DFlight API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are DFlight API and GrünstromIndex free for commercial use?

DFlight API has unclear commercial terms, and GrünstromIndex has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.